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Summary:
This annotates the splice point with 'HsSpliced ref e' where 'e' is the
result of the splice. 'ref' is a reference that the typechecker will fill with
the local type environment.

The finalizer then reads the ref and uses the local type environment, which
causes 'reify' to find local variables when run in the finalizer.

Test Plan: ./validate

Reviewers: simonpj, simonmar, bgamari, austin, goldfire

Reviewed By: goldfire

Subscribers: simonmar, thomie, mboes

Differential Revision: https://phabricator.haskell.org/D2286

GHC Trac Issues: #11832

x86_64-apple-darwin14, is the target for the 64bit simulator.
Ideally, we'd have (i386|armv7|arm64|x64_86)-apple-ios, yet,
many #ifdefs depend on `darwin`, notably libffi. Hence, this only adds
x86_64-apple-darwin14 as a target. This also updates the comment to
add the `-S` flag, and dump the output to stdout; and adjusts the
`datalayout` and `triple` values, as obtained through the method
mentioned in the comment.

Reviewers: hvr, erikd, austin, bgamari, simonmar

Reviewed By: simonmar

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2378

On Darwin versions with clock_gettime, #ifdefs will prevent the
mach-specific time functions from being used in most places, and
the mach time headers won't be included; however, this section
was guarded incorrectly and would still try to use them.

Fixes #12195.

varEnvElts can introduce unnecessary nondeterminism
and we can finally remove it, so that no one will use
it by accident. If someone wants to use varEnvElts they
should either use DVarEnv or use nonDetEltsUFM and document
why it doesn't introduce nondeterminism.

GHC Trac: #4012

This localizes the nondeterminism that varEnvElts could
have introduced, so that it's obvious that it's benign.

Test Plan: ./validate

Reviewers: simonpj, austin, bgamari

Subscribers: thomie, simonmar

Differential Revision: https://phabricator.haskell.org/D2390

GHC Trac Issues: #4012

We don't care about bit-for-bit reproducibility, so
I'm just documenting this as a possible source.

GHC Trac: #4012

This is a tiny refactor, replacing an ad-hoc local function
(TidyPgm.loookup_aux_id) with a solid global one (tidyVarOcc).

In deriving for Data, we make some auxiliary functions, but they
didn't always get distinct names (Trac #12245).  This patch fixes
it by using the same mechanism as for dictionary functions, namely
chooseUniqueOccTc.

Some assocated refactoring came along for the ride.

This makes sure that we don't introduce unnecessary
nondeterminism from vectorization.

Also updates dph submodule to reflect the change in types.

GHC Trac: #4012

Fixes Trac #7497 and #12151.   In some earlier upheaval I introduced
a bug in the ambiguity check for genreric-default method.

This patch fixes it.  But in fixing it I realised that the
sourc-location of any such error message was bogus, so I fixed
that too, which involved a slightly wider change; see the
comments with TcMethInfo.

I was able to hide the nondeterminism in some specialized
function, which I believe will be useful in other places.

GHC Trac: #4012

This reverts commit 63777579.

This reverts commit 01f449f4.

Test Plan: Validate, verify fusion

Reviewers: austin, hvr

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2376

GHC Trac Issues: #12354

Test Plan: Validate

Reviewers: austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2381

This was introduced by a cut-and-paste error.

Fixes issue T12165 by banning duplicate pattern synonyms
signatures. This seems to me the best solution because:

   1) it is coherent with the way we treat other duplicate signatures

   2) the typechecker currently doesn't try to apply a second
       signature to a pattern to see if it matches, probably because
       it assumes there is no more than one signature per object.

Test Plan: ./validate

Reviewers: goldfire, austin, mpickering, bgamari

Reviewed By: mpickering, bgamari

Subscribers: mpickering, thomie

Differential Revision: https://phabricator.haskell.org/D2361

GHC Trac Issues: #12165

Test Plan: Validate

Reviewers: austin, osa1

Reviewed By: osa1

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2377

GHC Trac Issues: #12355

GHC Trac: #4012

This documents nondeterminism in code generation and removes
the nondeterministic ufmToList function. In the future someone
will have to use nonDetEltsUFM (with proper explanation)
or pprUFM.

Summary:
This field is never set, but it was being tested and used to decide
whether to resolve an object or not.  This caused non-deterministic
crashes when using the RTS linker (see #12230).

I suspect this is not the correct fix, but putting it up so that Phyx
can tell us what the right fix should be.

Test Plan: validate

Reviewers: austin, Phyx, bgamari, erikd

Subscribers: erikd, thomie, ezyang

Differential Revision: https://phabricator.haskell.org/D2371

GHC Trac Issues: #12230

This avoids the interactive prompt of xelatex on error.

This makes pattern synonym signatures more consistent with normal
type signatures.

Updates haddock submodule.

Differential Revision: https://phabricator.haskell.org/D2083

Fixes #12343.

Testcase: `LC_ALL=C make -C utils/checkUniques`. Works with python2 and
python3.

Reviewed by: bgamari

Differential Revision: https://phabricator.haskell.org/D2372

Test Plan: validate

Reviewers: austin, bgamari, simonmar

Reviewed By: bgamari, simonmar

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2351

Test Plan: Validate, try tests in ticket

Reviewers: austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2336

GHC Trac Issues: #12194

Previously the flag was silently ignored due the #7679 and #8657. This,
however, seems unnecessarily brutal and makes experimentation unduly
difficult for users.

Test Plan: Validate

Reviewers: austin, simonmar

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2335

GHC Trac Issues: #7679, #8657